| 601 | DBDE | DOUBLE D EXPRESS, INC | | | SCAC1 |
| 602 | DBDE | DOUBLE D EXPRESS INC | | | SCAC4 |
| 603 | DBDG | DOUBLE DOG TRANSPORTATION | | | SCAC4 |
| 604 | DBDH | DBD EXPRESS | | | SCAC4 |
| 605 | DBDR | DOUBLE D TRUCKING | | | SCAC4 |
| 606 | DBDY | D-BAR-D | | | SCAC4 |
| 607 | DBE | Danube-Air Ltd. | Callsign: Dove, | H | AVCODES |
| 608 | DBED | DUNBAR, E D TRUCKING | | | SCAC4 |
| 609 | DBEE | D B EXPRESS | | | SCAC4 |
| 610 | DBEM | DOUBLE EIGHT MARINE S A | | | SCAC4 |
| 611 | DBEN | DREISBACH ENTERPRISES | | | SCAC4 |
| 612 | DBEP | DEVITO BROS ENTERPRISES INC | | | SCAC4 |
| 613 | DBES | DIAMONDBACK EXPRESS, INC | | | SCAC1 |
| 614 | DBFE | DOUBLE F ENTERPRISES INC | | | SCAC4 |
| 615 | DBFM | DOBBELS FARMS | | | SCAC4 |
| 616 | DBFO | ADBF-TOIX EQUIPMENT CORP | | | PWRC |
| 617 | DBFT | DOUBLE A FARMS LTD | | | SCAC4 |
| 618 | DBFZI | DB Fahrzeuginstandhaltung GmbH | | DE | VKM |
| 619 | DBG | Air Dabia (Gambia) Limited | Callsign: Danbo, | WAG | AVCODES |
| 620 | DBG | Döllnitzbahn GmbH | Mügeln | D | privat-bahn.de |
| 621 | DBG | Dampfzug-Betriebsgemeinschaft e.V. | Loburg | D | privat-bahn.de |
| 622 | DBG | Döllnitzbahn GmbH | Mügeln | D | privat-bahn.de |
| 623 | DBG | DB Gleisbau | | D | TRAFFIC |
| 624 | DBG | Deutsche Bahn Gleisbau | | DE | VKM |
| 625 | DBGC | DOUBLE G TRANSPORTATION LLC | | | SCAC4 |
| 626 | DBGG | DONALDSON, BRIAN GEORGE | | | SCAC4 |
| 627 | DBGI | DANBRO LOGISTICS INC | | | SCAC4 |
| 628 | DBGK | DOUBLE G TRUCKING & REPAIR LTD | | | SCAC4 |
| 629 | DBGM | Döllnitzbahn GmbH | | DE | VKM |
| 630 | DBGU | Dreambox Global | | | RSRV |
| 631 | DBGX | Debruce Grain, Inc. | added 1/2004; eliminated 4/2004; 7/2005 (not listed) | | NAKINA |
| 632 | DBGX | Dowdle Butane Gas Co., Inc. | added 1/1968; 4/1970-1/1980; eliminated 4/1986 | | NAKINA |
| 633 | DBGX | Dowdle Butane Gas Co., Inc. | added 1/68; 4/70-1/80; eliminated 4/86 | | NRHS |
| 634 | DBGX | *DOWDLE BUTANE GAS CO. | | | PWRC |
| 635 | DBGX | +DEBRUCE GRAIN, INC. | | | PWRC |
| 636 | DBGX | Dowdle Butane Gas | | | RSRV |
| 637 | DBGX | DEBRUCE GRAIN INC | | | SCAC4 |
| 638 | DBGZ | DEBRUCE GRAIN | | | PWRC |
| 639 | DBGZ | DB Gebrauchtzug | | D | TRAFFIC |
| 640 | DBH | Northeast Airlines Co. Ltd. | IATA: NS, IATA Prefix: 836, Name changed to Hebei Airlines. Taken over by Sichuan Airlines and renamed Hebei Airlines. | PRC | AVCODES |
| 641 | DBHI | DORAN BROTHERS INC | | | SCAC4 |
| 642 | DBHK | DOUBLE H TRUCKING INC | | | SCAC4 |
| 643 | DBHL | DOYLE, BRIAN HORSE TRANSPORT LIMITE | | | SCAC4 |
| 644 | DBIG | DBI LOGISTICS INC | | | SCAC4 |
| 645 | DBIK | DOLLAR BILL TRUCKING | | | SCAC4 |
| 646 | DBIN | DOBBIN, COLIN FARMS LTD | | | SCAC4 |
| 647 | DBINF | Infra SILESIA S.A. | | PL | VKM |
| 648 | DBIP | DAILY BROKERAGE INC | | | SCAC4 |
| 649 | DBIQ | DUMORE BROKERING INC | | | SCAC4 |
| 650 | DBJ | Duchess Of Brittany (Jersey) Ltd. | Callsign: Duchess, | GB | AVCODES |
| 651 | DBJ | Duchess of Britany (Jersey) Limited | | | ICAO1 |
| 652 | DBJ | De Bornholmske Jernbaner | 1935 - 1968 | DK | jernbanen.dk |
| 653 | DBJ | De Bornholmske Jernbaner | 1935 - 1968 | DK | TRAFFIC |
| 654 | DBJG | DBJ TRUCKING CO INC | | | SCAC4 |
| 655 | DBJJ | DOUBLE J TRUCKING COMPANY | | | SCAC4 |
| 656 | DBJL | DOBBS, J L INC | | | SCAC4 |
| 657 | DBJP | DOUBLE JJ TRANSPORTATION | | | SCAC4 |
| 658 | DBJR | DOUBLE J TRANSPORT INC | | | SCAC4 |
| 659 | DBJU | DENBA JAPAN CO., LTD. | | J | BIC |
| 660 | DBK | Dubrovnik Airline d.o.o. | IATA: 2D, Callsign: Seagull, Founded on 15 December 2004. Ceased operations on 23 October 2011. | HR | AVCODES |
| 661 | DBK | Dubrovnik Air | | | ICAO1 |
| 662 | DBK | DBK Historische Bahn e.V. | Crailsheim (DBK = Dampfbahn Kochertal) | D | privat-bahn.de |
| 663 | DBKA | DOBBS TRUCKING LLC | | | SCAC4 |
| 664 | DBKE | DAYBREAK EXPRESS, INC | | | SCAC1 |
| 665 | DBKE | DAYBREAK EXPRESS INC | | | SCAC4 |
| 666 | DBKI | DICE BROKERS INC | | | SCAC4 |
| 667 | DBKK | DAB TRUCKING | | | SCAC4 |
| 668 | DBKL | DELBERTS TRUCKING LLC | | | SCAC4 |
| 669 | DBKM | DINBOKOWITZ MARINE INC | | | SCAC4 |
| 670 | DBKP | DANNY B TRUCKING CORP | | | SCAC4 |
| 671 | DBKS | DIAMONDBAC | | | SCAC4 |
| 672 | DBKT | DOUBLE K TRUCKING | | | SCAC4 |
| 673 | DBKY | DUNBAR TRUCK LINES INC | | | SCAC4 |
| 674 | DBLB | DOUBLE B TRUCKING INC | | | SCAC4 |
| 675 | DBLC | DOUBLE L INC | | | SCAC4 |
| 676 | DBLD | DBL DEAN TRUCKING LLC | | | SCAC4 |
| 677 | DBLG | DOUBLE G TRUCKING | | | SCAC4 |
| 678 | DBLH | DOUBLE H TRUCKING | | | SCAC4 |
| 679 | DBLM | DOUBLE TIME EXPRESS | | | SCAC4 |
| 680 | DBLR | DOUBLE R TRANSFER | | | SCAC4 |
| 681 | DBLT | DBL ENTERPRISES | | | SCAC4 |
| 682 | DBLU | DIAMOND BLUE SHIPPING SOLUTIONS PVT LTD | | IND | BIC |
| 683 | DBLV | DOUBLE C TRANSPORT LLC | | | SCAC4 |
| 684 | DBLY | DUBBER, LEONARD | | | SCAC4 |
| 685 | DBM | Deutsche Bundesmarine | | D | TRAFFIC |
| 686 | DBMI | DISTRIBUTION REMY CORRIVEAU INC | | | SCAC4 |
| 687 | DBMR | DBM TRANSPORTATION SERVICES INC | | | SCAC4 |
| 688 | DBMS | DENOYER BROTHERS MOVING & STORAGE C | | | SCAC4 |
| 689 | DBMUS | DB Museum | | D | TRAFFIC |
| 690 | DBN | DB Netz | | D | TRAFFIC |
| 691 | DBNE | DOBCO ENTERPRISES LIMITED | | | SCAC4 |
| 692 | DBNJ | DRILL BLAST CORP OF N | | | SCAC4 |
| 693 | DBNN | DOUBLE NN TRANSPORT LTD | | | SCAC4 |
| 694 | DBO | Royal Phoenix Airlines | | WAN | AVCODES |
| 695 | DBOC | D & B OIL INCORPORATED | | | SCAC4 |
| 696 | DBOE | DIABLO EXPRESS | | | SCAC4 |
| 697 | DBOI | DUBOIS, LEN TRUCKING INC | | | SCAC4 |
| 698 | DBOM | DEBO MOVING & STORAGE INC | | | SCAC4 |
| 699 | DBOS | DUBOSE, M C TRUCKING COMPANY INC | | | SCAC4 |
| 700 | DBOT | DIAMOND B OILFIELD TRUCKING INC | | | SCAC4 |
